We recently did a test migration of one of ours Elasticsearch clusters from 1.7.3 to 2.4.0 which involved a lot of changes in pretty much every component of our core search infrastructure - system provisioning, indexing pipeline, querying layer and custom scoring plugin. We adjusted our config, mapp…

Performance degradation after ES upgrade (v1.7 -> v2.4)

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Performance degradation after ES upgrade (v1.7 -> v2.4)